I just picked up 3 CI items for $35. Two are Griswold and one is unmarked. I have all the info I need on the two Griswolds. One is a chopper with a body 2460 and handle 2458. The other is corn stick pan No. 273 with a 930A on it. My question is with the Plett pan. I would like to know who made it. The only marking is the letter A and made in USA.